Multi-DENCO Servicing and Maintenance
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 119
1
The equipment should be thoroughly tested to ensure there are no refrigerant leaks to comply with EN 378-4
Associated equipment should also be service in accordance with manufacturer's specifications.
Interval Action
Daily
1: Check for any outstanding alarms.
2: Check display for good operation.
3: Visual inspection of exterior condition of the unit.
4: Visual inspection in and around the unit for the presence of liquids, which may show signs of a leak.
Weekly
1: Inspect outdoor heat exchanger for freedom of airflow.
2: Inspect gaskets, leaks, insulation, fan bearings and water drain of the unit, pay attention for any unusual noises.
Monthly
1: Check cleanliness of filters – inspect for break up and suitable sealing. Replace if necessary.
2: (If fitted) check cleanliness of grilles.
3: Check cleanliness both inside and outside of the unit.
Every
Three
Months
1: Check that the evaporating and condensing pressures are acceptable.
2: Check safety protection features, such as low pressure and temperature alarms, operate correctly.
3: Check capacity control for correct operation and configuration.
4: Check electrical connections for tightness. Repair or replace all damaged terminals.
5: Check all component electrical currents are within acceptable limits.
6: Check refrigerant sight glass.
7: Check condensate drain for free flow and drainage.
8: Check for refrigerant leaks
1
: Inspect all accessible refrigeration pipework with an electronic leak detector paying
particular attention to flexible tubes, capillary tubes etc. Check all accessible pipework fixings for tightness and security.
9: Inspect oil charges and levels to identify any loss since last inspection – rectify as necessary.
10: Inspect fan touch protection devices for compliance and functionality.
11: Check operation of on-board electrode steam boiler humidifier (if fitted): Check drain down and fill function,
disposal pumps and bottle current. Replace any expired bottles.
12: Check function of EC water pump (F-Version & P-Version).
13: Visual inspection of expansion vessel (F-Version & P-Version).
Every
Six
Months
1: Check contactors for damage or eroding.
2: Check that the electrical contactor overloads functions are set correctly.
3: Check any crankcase heaters (if fitted) for correct operation.
4: Check the evaporator fans can rotate freely.
5: Check conditions of evaporator coils and clean as required. Inspect heat exchangers for free airflow, cleaned
and combed where necessary.
6: If not conducted within the last 6 months; change air filters.
7: Check colour code of sight glass moisture indicator.
8: Check compressors for smooth operation.
9: Check anti-vibration mountings (outdoor unit) for damage.
10: Check pipework and insulation for damage (indoor, outdoor and interconnecting pipework).
11: The glycol content should be checked (if applicable) then adjusted and recorded as necessary (water-based circuits).
12: Check the condition of the water pipework, water volume flow, valve operation, and the cleanliness of all the
strainers (water-based circuits).
13: Check the calibration and functionality of the unit controller.
14: Check casing and connected ducting for any air leakage – repair where required.
15: Check room conditions required and adjust unit settings as necessary.
16: Clean unit inside and out with vacuum cleaner and wipe down with moist cloth.
17: Check proper function of the refrigerant leakage detection system (if fitted) either through use of a service tool
or use of testing refrigerant.
Yearly
1: Test the high pressure safety switch cut out and adjust/replace as necessary (see chapter 8.3.5
'Commissioning
refrigerant circuits
' on page 103).
2: Check for blockage in water strainers and act if required.
3: Check water pressures in FreeCool circuit.
4: (If fitted) Check tightness and for leaks in and around any pressure relief valves
After 5
Years of
Operation
1: (If fitted) it is recommended that the pressure relief valve is replaced.
Tab. 10-1
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